Marine communication is an extremely important topic. A marine communication device, such as a VHF (Very High Frequency) Radio is crucial to the safety of all boaters. In conjunction with your interfaced GPS, your VHF radio can provide your exact location to rescue services if your distress button is ever used. In addition, your MMSI Registration gives rescue services information like emergency contacts and boat description. Click here to register for an MMSI number. It's free.